The agency also operates the Joe Kegans Unit state jail facility in Downtown Houston. The Huntsville Unit in Huntsville serves as the designated regional release center for prisoners arriving in the Houston area. Throughout the history of the Texas Prison System 90% of male prisoners, regardless of where they were being released, were sent to the unit for the final portions of their sentences before being released. Starting in September 2010 the TDCJ instead began to use regional release centers for male prisoners. Female prisoners throughout Texas who are not state jail prisoners or substance abuse felony punishment facility residents are released from the Christina Crain Unit in Gatesville. The Texas Youth Commission (TYC) operates the Houston District Office in Greater Sharpstown, Houston. The closest TYC correctional facility to Houston is the Al Price State Juvenile Correctional Facility in unincorporated Jefferson County, near Beaumont. The TYC announced that the Al Price facility will close by August 31, 2011. Federal government The United States Postal Service's main post office facility is the Houston Post Office at 401 Franklin Street in Downtown Houston. In February 2009 the U.S. Postal Service announced that it was going to sell the Houston Post Office. The party buying the facility is required to build a replacement facility. The postal service operates station branches in other parts of Houston. Not all city of Houston residents have "Houston, Texas" mailing addresses since the USPS does not base its mailing address names on actual municipal boundaries; some have Friendswood, Humble, Kingwood, Missouri City, and Stafford postal addresses. After the 1996 annexation of Kingwood, residents retained "Kingwood, Texas" mailing addresses, and some places in the city limits before the annexation had Kingwood mailing addresses. Residents of several other municipalities, including Jacinto City, Jersey Village, Nassau Bay, and West University Place, have "Houston, Texas" mailing addresses, and some residents of Missouri City also have Houston mailing addresses. The U.S. Citizenship and Immigration Services Houston Field Office and the Houston office of the U.S. Immigration and Customs Enforcement (ICE) are in Greenspoint and in Houston. An ICE Special Agent in Charge (SAC) principal field office is also in Houston. The Houston Contract Detention Facility, operated by the Corrections Corporation of America on behalf of ICE, is located in Houston. The Federal Reserve Bank of Dallas Houston Branch is located in the Fourth Ward of Houston. Elected officials Houston is represented in the